undefined-symbol

问题 This is a noob question. I'm trying to learn how to use SWIG to make a python interface for a C++ library. The library is a proprietary 3rd party library; it comes to me in the form of a header file (foo.h) and a static archive (libfoo.a). To simplify matters, I've cooked up an example which I think has the same pathology. Same error messages anyways. /* foo.hpp */ class TC { public: TC(); int i; private: }; For reference, here's foo.c. I only have the header and archive files for the real

问题 I am having an undefined symbol error at runtime, and when I look for the symbol in the relevant library, I get the result: nm -C -D /home/farmer/anaconda3/envs/general/lib/python3.6/site-packages/pyscannerbit/libScannerBitCAPI.so | grep empty_ U YAML::detail::node_data::empty_scalar[abi:cxx11] 00000000002b5860 T YAML::detail::node_data::empty_scalar[abi:cxx11]() But how is that possible? The symbol is both undefined, and also in the library? What? Or are these actually different symbols?

问题 Can anyone help me to figure out what is happening and how to solve this error? The following message happens when I try to import a module I compiled before: Python 3.1.4 (default, Mar 8 2012, 09:13:26) [GCC 4.3.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import pypt Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: /usr/local/lib/python3.1/site-packages/pypt.so: undefined symbol: PyUnicodeUCS4_FromString 来源： https

问题 After installing python-igraph with pip, I still can't import it. I've encountered such error around the internet but most solutions I've found were about reinstalling the module, which I already did. Any suggestions on how to fix this would be greatly appreciated. Thanks >>> import igraph Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python3.5/site-packages/igraph/__init__.py", line 34, in <module> from igraph._igraph import * ImportError: /usr/lib

问题 I want to be able to use Cmockery to mock C functions called from C++ code I'm testing. As a step towards that, I've renamed the Cmockery example run_tests.c to run_tests.cpp, and am attempting to compile and link it with cmockery.c: g++ -m32 -DHAVE_CONFIG_H -DPIC -I ../cmockery-0.1.2 -I /usr/include/malloc -c run_tests.cpp -o obj/run_tests.o gcc -m32 -DHAVE_CONFIG_H -DPIC -Wno-format -I ../cmockery-0.1.2 -I /usr/include/malloc -c ../cmockery-0.1.2/cmockery.c -o obj/cmockery.o g++ -m32 -o run

问题 I'm writing in C++ under XCode 4.6 on Mountain Lion. I'm trying to add and use the Apache log4cxx library. I installed the library this morning via Brew. I'm linking against liblog4cxx.dylib. I'm getting a link error that just one symbol can't be found: Undefined symbols for architecture x86_64: "log4cxx::Logger::forcedLog(log4cxx::helpers::ObjectPtrT const&, std::__1::basic_string, std::__1::allocator > const&, log4cxx::spi::LocationInfo const&) const", referenced from: I know it's finding

问题 I'm having some problems with my iPhone app not linking for the iPhone Simulator. It tells me there are undefined symbols: Undefined symbols for architecture i386: ".objc_class_name_NSRunLoop", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o ".objc_class_name_NSDate", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o ".objc_class_name_NSAutoreleasePool", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o pointer-to

问题 I need to use the STXXL library for a software project I am working on, but for some reason, I am having trouble compiling a test file. I am not very familiar with makefiles, so I might have mixed up in linking some of the libraries together. The dummy files I am using are Draw.h, Draw.cpp, and driver.cpp. As you can imagine, Draw.h declares a method draw() that is implemented in Draw.cpp, and driver.cpp contains the main function, and includes Draw.h and calls draw(). The makefile I am using

问题 I'm getting the following error message at compilation. Undefined symbols for architecture x86_64: "LSMDP2<HC_Base, HC_Base, Sine>::LSMDP2(int, int, std::unique_ptr<Forward, std::default_delete<Forward> >&, std::unique_ptr<BrownianMotionIncGenerator, std::default_delete<BrownianMotionIncGenerator> >&, std::unique_ptr<Driver, std::default_delete<Driver> >&, Sine&&, gsl_vector*, std::unique_ptr<Regression, std::default_delete<Regression> >&, std::unique_ptr<UniformSims, std::default_delete

问题 I have been trying to get a project of mine to run but I have run into trouble. After much debugging I have narrowed down the problem but have no idea how to proceed. Some background, I am using a python script inside C++ code. This is somewhat documented on Python, and I managed to get it running very well in my basic executable. #include and a -lpython2.6 and everything was grand. However, difficulty has arisen when running this python script from a shared library(.so). This shared library